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    110--9.8hp fuel trouble: UPDATE!!!!!!!

    I am helping a friend with a 72 model 9.8hp mercury and we have a fuel problem, it will run good at idle but as soon as you increase throttle it just loads up. First we checked compression, it was 125 on both, second we checked fire thru tester, that revealed a real strong blue spark on both...
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    no spark on one cylinder UPDATE!!!!

    I have a 25E74M Johnson that is eating my lunch!!!!!!!!!! I have changed points, condenser, plug wires, plugs and still I have no spark on my tester on the bottom cylinder. I have changed coil positions, unhooked the kill wires, set and reset the points at .020 and nothing. I got it going...
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    20r72r need fuel help

    I have a 20r72r Johnson that has set up for years that I am trying to get running. Let me start by listing what I have done so far, 1. New tank and all fuel lines replaced. 2. Replaced points and condenser and tested coils for continuity. 3. Rebuilt carb, knocked out all soft plugs and blew out...
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    Diff between motors

    Can anyone tell me what the differences are between the 20hp and 25hp engines around 72. I have a 20r72r and would like to get a little more power out of my motor. I have a manual that list these motors together with all the parts being the same. Whats the difference?
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